The story goes like this. The father of Shizi's wife tried to poison Shizi with his wife, and was discovered by Shizi's sister (namely Furong). Furong was poisoned by eating poisonous persimmons. Furong told her sister Shiziyan that if people found their poisoned bodies in the palace, the whole family would be implicated. So, Furong decided to exchange clothes with her sister Shiziyan. Let my sister run back to her mother's house disguised as herself, and then drown in the lotus pond disguised as a prince, so that no one will pursue her family. This is an old story (watch the first episode, and then watch 20 episodes to understand)

Modern story: On the way to be hunted down, Prince Shizi accidentally crossed the 2 1 century, at Park Hao's home (Park Hao is the reincarnation of the lotus). In the process of searching for the cause of death of Prince Shizi, Prince Shizi fell in love with Park Hao. After a series of events in modern times, Shizi found that the person drowned in the lotus pond might not be his wife, but his sister Furong. Finally, the mystery of the prince drowning was solved.